JPH0333373A - Concrete spacer - Google Patents

Abstract

PURPOSE:To facilitate mounting work and, at the same time, to make it possible to prevent positively falling-off or movement by interlocking respectively reinforcing bars crossing each other with main interlocking grooves and slave interlocking grooves at right angles to the main interlocking grooves and crossing out of alignment. CONSTITUTION:Main interlocking grooves 2 and 2 passing through a block body 1 in parallel with the axis thereof and opening to the side of the block body 1 with uneven openings its entire length are formed. After that, side opening type slave interlocking grooves 3 and 3 at right angles to the main interlocking grooves 2 and 2 and crossing out of alignment are formed. One reinforcing bar 41 of reinforcing bars 41 and 42 crossing each other is interlocking with the main interlocking grooves 2 and 2, and the other reinforcing bar 42 is interlocked with the slave interlocking grooves 3 and 3.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method for engaging reinforcing bars to ensure the vertical dimension between the reinforcing bars and the formwork, that is, the cover dimension of the concrete, when constructing reinforced concrete structures. Concerning the concrete spacers used.

(Prior Art) There is a concrete spacer that engages reinforcing bars in a disc-shaped or C-shaped concrete spacer having a reinforcing bar engagement groove in the center that communicates with the outside through a guide groove.

In some cases, a stopper is provided in the guide groove to prevent the guide from falling off.

In addition, there is also a type that receives reinforcing bars in a recessed part on the outer periphery, contacts the formwork with a leg on the opposite side of the recessed part, and ties up the reinforcing bars by passing a wire through the wire hole.

(Problem to be Solved by the Invention) In the case where reinforcing bars are simply engaged with engagement grooves through guiding grooves, vibrations of the reinforcing bars or contact with the spacer itself may cause the reinforcing bars to rotate and fall off, or It is easy to cause misalignment in the direction.

Products with a stopper are expensive and demand is limited.

When using wire to bind reinforcing bars, the work of tying each reinforcing bar one by one with wire is extremely troublesome.

(Means for Solving the Problems) A concrete spacer according to the present invention is a block body having a main engagement groove and a secondary engagement groove for reinforcing bars, and the main engagement groove penetrates the block body parallel to its axis. Further, the openings are opened at the side surface of the block body along the entire length thereof, and the secondary engagement groove is of a side-opening type that intersects the main engagement groove at right angles and off-centered.

The block body is a hollow cylindrical body having a flat part, and an opening opening to the outside of the main engagement groove is located in the flat part,
The subordinate engagement groove may be open to this flat portion.

Although the block body bisects a partially cylindrical body having a flat portion by a plane including its axis, the slave engagement groove may be open to this flat portion.

The side projection shape of the block body may be a trapezoid with one end of the main engagement groove inclined, and the master and slave engagement grooves may apparently intersect on the outside of the trapezoid.

The side projection shape of the block body is a parallelogram, the main engagement groove is arranged symmetrically with respect to a plane passing through the center of the opening, and the subordinate engagement groove is arranged point symmetrically with respect to the center of the parallelogram. , and the master and slave engaging grooves may intersect apparently on the outside of the periphery of the parallelogram.

(Operation) The openings on the side surfaces of different levels are pressed against one of the reinforcing bars that intersect with each other, for example, the horizontal bar, and the main engagement groove is engaged with this reinforcing bar.Then, the secondary engagement groove is inserted into the other reinforcing bar, for example, the vertical bar. Engage with the reinforcement.The formwork is assembled parallel to the reinforcing bars on the main engagement groove side and in contact with this spacer.When concrete is poured, the outer edges of the reinforcing bars on the main engagement groove side and the formwork are assembled. The vertical distance is the concrete cover dimension.

Concrete, plastic, etc. can be used as the material for this spacer. Further, the molding may be performed one by one, or a long object having a uniform cross section may be cut into a predetermined length.

When the block body is a hollow cylindrical body with a flat part, it is used by being placed at the intersection of reinforcing bars in the same way as in the above case. Since the meat is shaved off on the flat surface, less material is required and it is also lighter.

If the block body is a hollow cylindrical body with a flat part and is one of two halves divided by a plane including its axis, the body will have the flesh removed from the flat part and half of it will be gone, so the material will be extremely small and the weight will be It also becomes much lighter.

If the side projection shape of the block is trapezoidal, if the intersections of reinforcing bars are tied together with wires, etc., they will be installed on vertical and horizontal reinforcing bars at the locations where they are removed.

If the side projection shape of the block is a parallelogram, it can be used in the same way as the trapezoidal block described above if the intersections of reinforcing bars are tied together with wire, etc.
It can be used in exactly the same way even in the 0' inverted state, and there are fewer restrictions on the directionality compared to the trapezoid.

(Example) 1 is a block body, 2 is a main engagement groove for reinforcing bars, and 3 is a secondary engagement groove for reinforcing bars. The main engagement groove 2 is parallel to the axis 1 of the block body 1 and extends over the entire length of the block body 1, and is open to the side surface of the block body l through an opening 21 with different steps.

The secondary engagement groove 3 intersects the main engagement 112 at right angles and off-centered, and the side surface of the block body 1 is of a side-open type that is open to the outside.

In the drawing, 41 is a horizontal reinforcing bar, 42 is a vertical reinforcing bar, and the opening 21
is applied to the horizontal reinforcement 41, the secondary engagement groove 3 is applied to the vertical reinforcement 42, the block body l is pushed in, the horizontal reinforcement 41 is engaged in the main engagement groove 2, and the secondary engagement groove 3 is engaged. The vertical reinforcing bars 42 are engaged. In addition to the main engagement 12 being at a different level from the opening 21, the secondary engagement groove 3 engages with the vertical reinforcing bars 42, so that the block body 1 does not rotate or move in the direction of the reinforcing bars even when subjected to vibration or external pressure. It will not shift. A predetermined cover size can be obtained by placing the formwork perpendicularly to the block body 1 outside the horizontal reinforcement 41 and abutting the block body 1 outside the horizontal reinforcement 41, and pouring concrete. .

The block body 1 is a hollow cylindrical body having a flat part 51, and the opening 21 through which the main engagement groove 2 opens to the outside is located in this flat part 51, and the sub-engaging groove 3 is also opened to this flat part 51.

This will reduce material costs, make it lighter, and make it easier to attach it to the reinforcing bars.

FIG. 2 shows an example in which the truncated cylindrical body shown in FIG. 1 is divided into two by a plane including its axis, and one half is used as a block body 1. This cuts material costs and weight in half.

FIG. 3 shows a case where the side projection shape of the block l is a trapezoid with one end side of the main engagement groove 2 inclined, and the intersection between the main engagement grooves 2 and 3 is apparently made on the outside of this trapezoid. It is.

In this way, even if the intersections of the vertical and horizontal reinforcing bars 42 and 41 are tied together with a wire W or the like, the block body I can be secured to the reinforcing bars 41 and 42 while avoiding the wire, and a predetermined cover size can be obtained.

In Fig. 4, the side projection shape of the block l is a parallelogram, and the main engagement grooves 2' and 2'' and the slave engagement grooves 3' and 3'' are point symmetrical with respect to the center O of this parallelogram. placed,
This is a case where the master and slave engaging grooves 2' and 3' and 2" and 3" apparently intersect on the outside of the periphery of this parallelogram.

In this way, the block body 1 can be used in exactly the same way even if it is rotated by 180'' on the projection plane, so there is room for choice in directionality and it is easy to use.In addition, in this case, the main engagement grooves 29 and 2 ”, and a long object having an opening 21 is sequentially cut into a predetermined length on an inclined surface to form a block body, and a secondary engagement l is formed by secondary processing.
A spacer can be obtained by forming 3” with l39, so
Manufacturing becomes easier.

(Effect of the invention) According to claim (1) of the present invention, the main engagement groove engages one reinforcing bar, and the secondary engagement groove engages another reinforcing bar intersecting this - reinforcing bar. Therefore, it will not rotate, fall off, or shift in the direction of the reinforcing steel due to vibrations, etc. Therefore, it is easy to install the spacer, the specified cover size can be reliably guaranteed, and the structure is simple. can be provided at a low price.

According to claim (2), it is possible to provide a block body that eliminates excess thickness by forming the block body into a hollow cylindrical body.

Further, according to claim (3), since the block body is one of two parts divided by a plane including the axis, the material cost and weight can be halved.

According to claim (4), even if the intersections of vertical and horizontal reinforcing bars are tied together with wire or the like, the block body can be secured to the vertical and horizontal reinforcing bars while avoiding the wires.

According to claim (5), when avoiding binding wires, etc. at intersections of vertical and horizontal reinforcing bars, the block body can be used in exactly the same way even when rotated by 180 on the projection plane, so there is no choice in directionality. It is easy to use, easy to manufacture, and easy to use.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a concrete example of the concrete spacer according to the present invention in use, FIG. 2 is a perspective view of a half of the same spacer, FIG. The figure is a side view of still another embodiment of the spacer. l...Block body, 2...Main engagement groove, 3...Sub-engagement groove,
11... Axis line, 21... Opening, 51... Plane part, 2',
2"◆・Main engagement groove, 3s13"...Sub-engagement groove, O...Center.

Claims (5)

[Claims] (1) A block body having a main engagement groove and a sub-engagement groove for reinforcing bars, the main engagement groove passing through the block body parallel to its axis and extending over its entire length with openings at different levels on the sides of the block body. A concrete spacer characterized in that it is open, and the secondary engagement groove is a side-open type that intersects the main engagement groove at right angles and off-centered. (2) the block body is a hollow cylindrical body having a flat part, and the opening opening to the outside of the main engagement groove is located in the flat part;
2. The concrete spacer according to claim 1, wherein the slave engagement groove is also open to the flat surface. (3) According to claim (1), the block body bisects a partially cylindrical body having a plane portion by a plane including its axis, and the slave engagement groove is open to the plane portion. concrete spacer. (4) A side projection shape of the block body is a trapezoid with one end of the main engagement groove inclined, and the master and slave engagement grooves apparently intersect on the outside of the trapezoid. concrete spacer. (5) The side projection shape of the block body is a parallelogram, the main engagement groove is arranged symmetrically with respect to a plane passing through the center of the opening, and the subordinate engagement groove is located at the center of the parallelogram. 2. The concrete spacer according to claim 1, wherein the master and slave engaging grooves are arranged symmetrically with respect to each other, and the master and slave engaging grooves apparently intersect on both outer sides of the parallelogram.